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New Triphenylamine-Based Oligomeric Schiff Bases Containing Tetraphenylsilane Moieties in the Backbone
摘要： Three new triphenylamine-based oligomeric Schiff bases (polySB1, polySB2 and polySB3) containing tetraphenylsilane core (TPS-core) in the main chain were obtained from TPS-core-based diamines and bis(4-formylphenyl)phenylamine by a high-temperature polycondensation reaction. These new oligomers were structurally characterized by FT-IR, NMR and elemental analysis. All polySBs were highly soluble in common organic solvents, such as chloroform, tetrahydrofuran and chlorobenzene. Samples showed moderate molecular average molecular weight (Mw) and a high thermal stability above 410 °C. Likewise, polySBs showed absorption near 400 nm in the UV-vis range and photoluminescence. The HOMO levels and band-gap values were found in the ranges of ?6.06 to ?6.18 eV and 2.65–2.72 eV, respectively. The lowest band-gap value was observed for polySB2, which could be attributed to a more effective π-conjugation across the main chain. The results suggest that silicon-containing polySBs are promising wide-band-gap semiconductors materials for optoelectronic applications.
关键词： optoelectronic applications,tetraphenylsilane,oligomeric Schiff bases,triphenylamine
更新于2025-09-19 17:15:36
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Selection of optimal glazing material for solar thermal applications using grey relational analysis
摘要： This article deals the selection of optimal glazing materials for solar thermal applications with multiple performance characteristics among the twelve alternatives using the Taguchi’s grey relational analysis approach. The processing parameters thermal properties, mechanical properties, optical properties, environmental and economic conditions are optimised with multi-response characteristics, including density, thermal conductivity, specific heat capacity, the coefficient of thermal expansion, notch impact strength, tensile strength, refractive index, transmittance, cost, and environment. In this investigation, twelve alternative materials and ten criteria used for material selection for the optimal design. The outcomes revealed that crystal glass has the highest grey grade of 0.588, which is the optimal glazing material among the twelve alternatives.
关键词： Grey relational grade,Glazing,Solar thermal applications,Material selection,Grey relational Analysis
更新于2025-09-19 17:15:36
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Evolution of nanocrystal size distribution in porous silicon nanoparticles during storage in aqueous media: X-ray diffraction analysis
摘要： X-ray diffraction studies of electrochemically prepared mesoporous and microporous silicon particles were carried out to monitor their dissolution in aqueous media. The dissolution process was found to result in either decreasing or an increasing of the mean size of silicon nanocrystallites in mesoporous and microporous samples, respectively. The evolution of nanocrystallite size was related by polydispersity of the initial size distribution and it was described by using a model of Bshrinking spheres.^ The proposed approach was used to confirm an effect of biopolymer surrounding of silicon nanocrystallites on their stability in aqueous medium. The obtained results and developed model can be useful for potential biomedical applications of porous silicon.
关键词： Biomedical applications,Oxidation,Nanoparticles,Diffraction,Silicon,X-ray
更新于2025-09-19 17:15:36
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Innovative in situ photocuring-assisted 3D plotting technique for complex-shaped ceramic architectures with high shape retention
摘要： We herein propose a novel type of additive manufacturing (AM) technique, denoted as "in situ photocuring-assisted 3D plotting", which can rapidly solidify extruded green filaments comprised of ceramic powders and photocurable monomers using UV light during 3D plotting. To accomplish this, the rheological properties and photocuring behavior of the ceramic slurry were carefully tailored, particularly by using a mixture of diruethane dimethacrylate (UDMA) and triethylene glycol dimethacrylate (TEGDMA) monomers as the photocurable vehicle. This innovative approach enabled the favorable extrusion of the ceramic slurry through a fine nozzle with high green strength after photocuring, and thus complex-shaped ceramic architectures with high shape retention could be constructed. As an example, a free-standing helical structure with a circular cross-section was successfully produced even without the use of any supporting materials. In addition, a porous ceramic scaffold with a tightly controlled porous structure could be produced.
关键词： Strength,Porosity,Extrusion,Structural applications,Suspensions
更新于2025-09-19 17:15:36
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Organic crystalline materials in flexible electronics
摘要： Flexible electronics have attracted considerable attention recently given their potential to revolutionize human lives. High-performance organic crystalline materials (OCMs) are considered strong candidates for next-generation flexible electronics such as displays, image sensors, and artificial skin. They not only have great advantages in terms of flexibility, molecular diversity, low-cost, solution processability, and inherent compatibility with flexible substrates, but also show less grain boundaries with minimal defects, ensuring excellent and uniform electronic characteristics. Meanwhile, OCMs also serve as a powerful tool to probe the intrinsic electronic and mechanical properties of organics and reveal the flexible device physics for further guidance for flexible materials and device design. While the past decades have witnessed huge advances in OCM-based flexible electronics, this review is intended to provide a timely overview of this fascinating field. First, the crystal packing, charge transport, and assembly protocols of OCMs are introduced. State-of-the-art construction strategies for aligned/patterned OCM on/into flexible substrates are then discussed in detail. Following this, advanced OCM-based flexible devices and their potential applications are highlighted. Finally, future directions and opportunities for this field are proposed, in the hope of providing guidance for future research.
关键词： Device fabrication,Flexible electronics,Organic crystalline materials,Charge transport,Applications
更新于2025-09-19 17:15:36
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[IEEE 2018 Asia Communications and Photonics Conference (ACP) - Hangzhou, China (2018.10.26-2018.10.29)] 2018 Asia Communications and Photonics Conference (ACP) - Photonic generation of microwave frequency shift keying signals based on dual parallel Mach-Zehnder modulator structure
摘要： A novel scheme to generate microwave frequency shift keying (FSK) signals is proposed and verified by a simulation. The main devices are two single-drive Mach Zehnder modulators (MZM) and a commercial phase modulator (PM). They are parallelly settled to perform the FSK signal generation. In this simulation work, two MZMs are driven by the RF signals with a phase difference which is introduced by an electrical phase shifter (EPS). Simultaneously, the PM is driven by a binary coding signal. The simulation results show that when the two MZMs are biased at the maximum transmission point (MATP), a microwave FSK signal can be obtained with the frequency is two times as large as the RF frequency for bit '0' and four times as large as the RF frequency for bit '1', respectively. It should be noted that the system shows excellent adaption to the non-ideal extinction radio and the inherent inaccurate phase shift of the electrical phase shifter. Therefore, the generated microwave FSK signal can meet the requirement of high-frequency applications.
关键词： high-frequency applications,microwave signal generation,microwave photonics,frequency shift keying
更新于2025-09-19 17:15:36
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[IEEE 2018 15th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON) - Chiang Rai, Thailand (2018.7.18-2018.7.21)] 2018 15th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON) - A Printed Circular Monopole Antenna with Slot and Modified Ground Plane for UWB Applications
摘要： This paper presents a design of a circular monopole antenna for ultra wideband (UWB) applications. The antenna is fed by a 50 (cid:2) tapered microstrip line, and printed on a FR4 substrate with relative permittivity of 4.3 and height of 1.6 mm. All optimal parameters of a circular monopole with slot have been presented to accomplish |S11| better than -10 dB with good radiation over UWB frequency. The design includes a modified partial ground plane to enhance the S-parameter characteristics and radiation properties across the whole UWB frequency band. The parameters, which affect the performance of the antenna with respect to frequency characteristics, are investigated and reported.
关键词： Slot Antenna,A Printed Circular Monopole Antenna,Modified Ground Plane,UWB Applications
更新于2025-09-19 17:15:36
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Multi-functional MnO <sub/>2</sub> nanomaterials for photo-activated applications by a plasma-assisted fabrication route
摘要： Supported MnO2-based nanomaterials were fabricated on fluorine-doped tin oxide substrates using plasma enhanced-chemical vapor deposition (PE-CVD) between 100 °C and 400 °C, starting from a fluorinated Mn(II) diamine diketonate precursor. Growth experiments yielded β-MnO2 with a hierarchical morphology tuneable from dendritic structures to quasi-1D nanosystems as a function of growth temperature, whose variation also enabled a concomitant tailoring of the system fluorine content, and of the optical absorption and band gap. Preliminary photocatalytic tests were aimed at the investigation of photoinduced hydrophilic (PH) and solid phase photocatalytic (PC) performances of the present nanomaterials, as well as at the photodegradation of Plasmocorinth B azo-dye aqueous solutions. The obtained findings highlighted an attractive system photoactivity even under visible light, finely tailored by fluorine content, morphological organization and optical properties of the prepared nanostructures. The results indicate that the synthesized MnO2 nanosystems have potential applications as advanced smart materials for anti-fogging/self-cleaning end uses and water purification.
关键词： anti-fogging,photoactivated applications,fluorine doping,photocatalysis,water purification,self-cleaning,plasma-assisted fabrication,MnO2 nanomaterials
更新于2025-09-19 17:15:36
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The electronic applications of stable diradicaloids: present and future
摘要： Organic molecules with unpaired electrons are intriguing for advanced applications in molecular electronics, spintronics and organic batteries, as well as other possible applications. Among them, diradicaloids have received growing attention due to the characteristic resonance structures between open-shell and closed-shell forms that lead to unique properties such as low energy bandgap and strong intermolecular spin–spin interaction. Therefore, in recent years, vast efforts have been devoted to investigate the synthesis, structure and fundamental properties of diradicaloids. However, the electronic applications of diradicaloids still remain in an early stage. Only a few diradicaloids have already found their place in electronic devices. In this perspective, we summarize the recent development of electronic applications of stable diradicaloids. The challenges and opportunities of stable diradicaloids for future electronic applications are also discussed.
关键词： spintronics,organic electronics,organic batteries,OFETs,NIR dyes,OPDs,diradicaloids,electronic applications
更新于2025-09-19 17:15:36
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Biomedical applications of mid-infrared quantum cascade lasers – a review
摘要： Mid-infrared spectroscopy has been applied to research in biology and medicine for more than 20 years and conceivable applications have been identified. More recently, these applications have been shown to benefit from the use of quantum cascade lasers due to their specific properties, namely high spectral power density, small beam parameter product, narrow emission spectrum and, if needed, tuning capabilities. This review provides an overview of the achievements and illustrates some applications which benefit from the key characteristics of quantum cascade laser-based mid-infrared spectroscopy using examples such as breath analysis, the investigation of serum, non-invasive glucose monitoring in bulk tissue and the combination of spectroscopy and microscopy of tissue thin sections for rapid histopathology.
关键词： quantum cascade lasers,glucose monitoring,mid-infrared spectroscopy,histopathology,breath analysis,biomedical applications
更新于2025-09-19 17:15:36